Alert archive / Iowa / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 100, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 12, 1994, 10:14 PM CDT for Hamilton County, Iowa. It was in force for 31 min.
The area
The counties it named.
The facts
- Issued
- Jun 12, 1994, 10:14 PM CDT (03:14 UTC)
- Expired
- Jun 12, 1994, 10:45 PM CDT
- In force
- 31 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Hamilton County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.2 hours before the alert went out and 250 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 4262 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1255 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 514 m²/s²
- Significant tornado parameter
- 4.3
- Supercell composite
- 35.1
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jun 12, 8:55 PM CDT, 1 hour 19 minutes before
IAZ006>011-016>019-026>029-038>040-130300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 855 PM CDT SUN JUN 12 1994 ...A TORNADO WATCH CONTINUES FOR PORTIONS OF NORTH CENTRAL IOWA UNTIL 10 PM TONIGHT... AT 850 PM...NATIONAL WEATHER SERVICE RADAR IN WATERLOO WAS SHOWING SEVERE THUNDERSTORMS CONTINUING ACROSS THE NORTHWEST THIRD OF IOWA...ALONG THE IOWA/MINNESOTA BORDER. THESE THUNDERSTORMS WERE MOVING EAST SOUTHEAST AT 35 MPH. NORTH CENTRAL IOWANS WILL SEE THUNDERSTORM ACTIVITY MOVING THROUGH THE BRITT...BUFFALO CENTER AND FOREST CITY AREAS AFTER 900 PM CDT. THESE STORMS WILL EVENTUALLY REACH THE NORTHWOOD...CLEAR LAKE AND GARNER AREAS BY 930 PM. SOME OF THESE STORMS MAY TURN SEVERE PRODUCING LARGE HAIL...DAMAGING THUNDERSTORM WINDS...TORRENTIAL RAINS AND POSSIBLY TORNADOES. A TORNADO WATCH REMAINS IN EFFECT FOR THOSE PORTIONS OF NORTH CENTRAL IOWA TO THE WEST OF I-35 THROUGH 10 PM. AT SIGNS OF AN IMPENDING STORM...TOWERING THUNDERHEADS...DARKENING SKIES...LIGHTNING AND INCREASING WINDS...MOVE TO A PLACE OF SAFETY. TUNE IN NOAA WEATHER RADIO OR YOUR LOCAL RADIO OR TV STATION FOR THE LATEST WEATHER INFORMATION. TRS
Special weather statement, Jun 12, 8:59 PM CDT, 1 hour 15 minutes before
IAZ006>011-016>019-026>029-038>040-130300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 855 PM CDT SUN JUN 12 1994 ...A TORNADO WATCH CONTINUES FOR PORTIONS OF NORTH CENTRAL IOWA UNTIL 10 PM TONIGHT... AT 850 PM...NATIONAL WEATHER SERVICE RADAR IN WATERLOO WAS SHOWING SEVERE THUNDERSTORMS CONTINUING ACROSS THE NORTHWEST THIRD OF IOWA...ALONG THE IOWA/MINNESOTA BORDER. THESE THUNDERSTORMS WERE MOVING EAST SOUTHEAST AT 35 MPH. NORTH CENTRAL IOWANS WILL SEE THUNDERSTORM ACTIVITY MOVING THROUGH THE BRITT...BUFFALO CENTER AND FOREST CITY AREAS AFTER 900 PM CDT. THESE STORMS WILL EVENTUALLY REACH THE NORTHWOOD...CLEAR LAKE AND GARNER AREAS BY 930 PM. SOME OF THESE STORMS MAY TURN SEVERE PRODUCING LARGE HAIL...DAMAGING THUNDERSTORM WINDS...TORRENTIAL RAINS AND POSSIBLY TORNADOES. A TORNADO WATCH REMAINS IN EFFECT FOR THOSE PORTIONS OF NORTH CENTRAL IOWA TO THE WEST OF I-35 THROUGH 10 PM. AT SIGNS OF AN IMPENDING STORM...TOWERING THUNDERHEADS...DARKENING SKIES...LIGHTNING AND INCREASING WINDS...MOVE TO A PLACE OF SAFETY. TUNE IN NOAA WEATHER RADIO OR YOUR LOCAL RADIO OR TV STATION FOR THE LATEST WEATHER INFORMATION. TRS
Special weather statement, Jun 12, 9:45 PM CDT, 29 minutes before
IAZ006>011-016>019-026>029-038>040-130400- SPECIAL WEATHER STATEMENT...CORRECT TIME IN HEADLINE NATIONAL WEATHER SERVICE WATERLOO IA 945 PM CDT SUN JUN 12 1994 ...A TORNADO WATCH CONTINUES FOR A LARGE PART OF IOWA UNTIL 4 AM... AT 940 PM RADAR INDICATED A LINE OF STRONG THUNDERSTORMS FROM 5 MILES WEST OF MASON CITY TO NEAR FORT DODGE. THESE STORMS WERE MOVING SOUTHEAST AT 35 MPH AND WILL BE CAPABLE OF PRODUCING WINDS UP TO 50 MPH...BRIEF HEAVY RAINS AND DEADLY LIGHTNING. CITIES TO BE AFFECTED BY THE STORMS THROUGH 1015 PM INCLUDE MASON CITY ...CLEAR LAKE AND ALEXANDER. THEY WILL ARRIVE IN HAMPTON BY 1015 PM. A TORNADO WATCH IS IN EFFECT FOR AREAS MAINLY SOUTH OF HIGHWAY 18 AND WEST OF HIGHWAY 218 UNTIL 4 AM. STAY TUNED TO NOAA WEATHER RADIO OR COMMERCIAL T.V. OR RADIO FOR LATER STATEMENTS AND POSSIBLE WARNINGS. COLLAR
Special weather statement, Jun 12, 9:47 PM CDT, 27 minutes before
IAZ006>011-016>019-026>029-038>040-130400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 945 PM CDT SUN JUN 12 1994 ...A TORNADO WATCH CONTINUES FOR A LARGE PART OF IOWA UNTIL 10 PM... AT 940 PM RADAR INDICATED A LINE OF STRONG THUNDERSTORMS FROM 5 MILES WEST OF MASON CITY TO NEAR FORT DODGE. THESE STORMS WERE MOVING SOUTHEAST AT 35 MPH AND WILL BE CAPABLE OF PRODUCING WINDS UP TO 50 MPH...BRIEF HEAVY RAINS AND DEADLY LIGHTNING. CITIES TO BE AFFECTED BY THE STORMS THROUGH 1015 PM INCLUDE MASON CITY ...CLEAR LAKE AND ALEXANDER. THEY WILL ARRIVE IN HAMPTON BY 1015 PM. A TORNADO WATCH IS IN EFFECT FOR AREAS MAINLY SOUTH OF HIGHWAY 18 AND WEST OF HIGHWAY 218 UNTIL 4 AM. S.TAY TUNED TO NOAA WEATHER RADIO OR COMMERCIAL T.V. OR RADIO FOR LATER STATEMENTS AND POSSIBLE WARNINGS. COLLAR
Special weather statement, Jun 12, 9:47 PM CDT, 27 minutes before
IAZALL-130340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 947 PM CDT SUN JUN 12 1994 ...TORNADO WATCH IN EFFECT FOR ALL EXCEPT THE EXTREME NORTHEAST CORNER OF IOWA UNTIL 4 AM MONDAY MORNING... AT 932 PM...A 25 TO 35 MILE WIDE BAND OF INTENSE THUNDERSTORMS WAS LOCATED FROM JUST NORTH OF SIOUX CITY NORTHEAST TO ABOUT 10 MILES WEST OF MASON CITY. SEVERAL OF THE STORMS IN THIS AREA HAVE BEEN PRODUCING TORRENTIAL RAIN...NEARLY CONTINUOUS DEADLY LIGHTNING...WINDS GUSTS OF 40 TO 50 MILES AN HOUR AND HAIL. THESE STORMS WERE PART OF A MUCH LARGER AREA OF SHOWERS AND STORMS LOCATED ALONG AND NORTH OF A LINE FROM 20 MILES NORTH O OMAHA/COUNCIL BLUFFS NORTHEAST TO CRESCO. CRESCO IS 50 MILES NORTH OF WATERLOO. THE SHOWERS AND STORMS WERE MOVING EAST SOUTHEAST AT 30 MILES AN HOUR. BARLOW
Special weather statement, Jun 12, 9:48 PM CDT, 26 minutes before
IAZ006>011-016>019-026>029-038>040-130400- SPECIAL WEATHER STATEMENT...CORRECT TIME IN HEADLINE NATIONAL WEATHER SERVICE WATERLOO IA 945 PM CDT SUN JUN 12 1994 ...A TORNADO WATCH CONTINUES FOR A LARGE PART OF IOWA UNTIL 4 AM... AT 940 PM RADAR INDICATED A LINE OF STRONG THUNDERSTORMS FROM 5 MILES WEST OF MASON CITY TO NEAR FORT DODGE. THESE STORMS WERE MOVING SOUTHEAST AT 35 MPH AND WILL BE CAPABLE OF PRODUCING WINDS UP TO 50 MPH...BRIEF HEAVY RAINS AND DEADLY LIGHTNING. CITIES TO BE AFFECTED BY THE STORMS THROUGH 1015 PM INCLUDE MASON CITY ...CLEAR LAKE AND ALEXANDER. THEY WILL ARRIVE IN HAMPTON BY 1015 PM. A TORNADO WATCH IS IN EFFECT FOR AREAS MAINLY SOUTH OF HIGHWAY 18 AND WES8T OF HIGHWAY 218 UNTIL 4 AM. STAY TUNED TO NOAA WEATHER RADIO OR COMMERCIAL T.V. OR RADIO FOR LATER STATEMENTS AND POSSIBLE WARNINGS. COLLAR
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 7:08 PM CDT | Tornado Warning | DMX | Dickinson | 37 min |
| Jun 12, 7:15 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 30 min |
| Jun 12, 7:45 PM CDT | Severe Thunderstorm Warning | DMX | Clay, Dickinson | 30 min |
| Jun 12, 8:15 PM CDT | Severe Thunderstorm Warning | DMX | Clay, Palo Alto | 30 min |
| Jun 12, 8:25 PM CDT | Tornado Warning | DMX | Palo Alto | 35 min |
| Jun 12, 8:55 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth | 35 min |
| Jun 12, 9:26 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt | 34 min |
| Jun 12, 9:37 PM CDT | Severe Thunderstorm Warning | DMX | Webster | 38 min |
| Jun 12, 9:41 PM CDT | Tornado Warning | DMX | Wright | 34 min |
| Jun 12, 9:56 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin | 34 min |
| Jun 12, 10:58 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 47 min |
| Jun 12, 11:31 PM CDT | Severe Thunderstorm Warning | DMX | Fayette | 29 min |
| Jun 12, 11:38 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 22 min |
| Jun 13, 12:10 AM CDT | Severe Thunderstorm Warning | DMX | Adams | 14 min |
| Jun 13, 12:54 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas | 21 min |
| Jun 13, 1:03 AM CDT | Severe Thunderstorm Warning | DMX | Marion | 28 min |
| Jun 13, 1:03 AM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 28 min |
| Jun 13, 1:19 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 26 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1994Every severe thunderstorm warning in 1994
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.